Premium
THE RELATIVE TOXICITIES OF SEVERAL PESTICIDES TO NAIADS OF THREE SPECIES OF STONEFLIES
Author(s) -
Sanders Herman O.,
Cope Oliver B.
Publication year - 1968
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1968.13.1.0112
Subject(s) - dieldrin , endrin , toxicology , pesticide , bioassay , parathion , biology , organophosphate , chlorpyrifos , environmental chemistry , parathion methyl , chemistry , ecology
Static bioassays were conducted to determine the relative acute toxicities of some insecticides, herbicides, fungicides, a defoliant, and a molluscicide to the naiads of three species of stonefly, Pteronarcys californica, Pteronarcella badia, and Claassenia sabulosa. Toxic effects were measured by determination of median lethal conen ( lc 50 ) for 24‐, 48‐, and 96‐hr exposures, at 15.5C. Endrin and dieldrin were the most and DDT the least toxic of the chlorinated hydrocarbon insecticides tested. Parathion was the most toxic organophosphate insecticide to P. californica naiads, but dursban was the most toxic to P. badia and C. sabulosa naiads. Trichlorofon (Dipterex) was the least toxic to all three species. P. badia, the species of smallest size, was the species most susceptible to most pesticides, followed in descending order of sensitivity by C. sabulosa and P. californica. Smaller specimens of P. californica naiads were consistently more susceptible to some insecticides than larger specimens of the same species.